Superheater.



N0 MODEL.

PATENTED MAY .24, 1904.

J. A. STEVENS.

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THE'NDRRS PETERS co., PEOTQLIYHO" WASHINGYM, 0. c4

No.760,81,6. I PATBNTBDMAY24,19O4.

' J. ALSTEVENS.

SUPERHEATER.

APPLIGATION FILED mm. 12, 1902 NO MODEL. 4 SHEETS-SHEET 2.

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PATENTED MAY 24, 1904. J. A. STEVENS. ,SUPBRHEATB-R. APPLICATION FILED DEC. 12, 1902.

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N00 MODEL.

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' J. A. STEVENS.

- SUPERHEATER.

urnouron FILED nnc.12, 1902. no MODEL. 4 SHEETS-SHEET 4.

Z57 Jwasaii Y iikmgemL Fa? mm 1 v v v WITNESSES: I mnwran l I er I v I Q ATTORNEY.

PATENTED MAY 24, 1904. Y

Patented May '24, 1904.

.UNITED ST TES PATENT ()FFICE.

JOHN A. STEVENS, OF LOWELL, MASSACHUSETTS.

" SU PERHEATER.

SPECIFICATION formingpart of Letters Patent No. 760,816, dated May 24, 1904.

I Application filed December 12,1902. Serial No. 134,952. (No model.)

To all whom it may concern.-

"Be itfknown'that I, J OHN AlSTEvENs, a citizen of the United States, residing at Lowell, in the county of Middlesex and State of Massachusetts, have invented certain new and use.- ful Improvements in Superheaters, of which --the following is a specification.

a temperature reduced to a degree that will not burn out the steam-circulating. tubes, and the resulting gaseous products of combustion are caused to circulate through a series of passes traversing the steam-circulating conduits. The steam-circulating system comprises a series of horizontal header-sections connected by tubes which carry the steam to and fro across the path of theheating-gases downwardly throughthe passes ofthe superheating-chamber, the headers being of such construction that-the number of header-sections and the number of banks of tubes em- I ployed can readily be reduced or increased to vary the heating-surface.

' The particular features ofthe improvements will more fully appear by reference'to the following description and the accompanying drawings, representing the'invention.

In the accompanying drawings,'Figure represents a sectional elevation of afsup'erheater embodying the invention, taken on the line 1 1 of Fig. 2. Fig. 2 represents a sectional elevation thereof, taken on the line 2 2 of Fig. 1. Fig. 3 represents a front elevation, with parts removed, in illustration thereof. Fig. 4:, represents a transverse vertical sectlonal view of a modified form of, the invention. Fig. 5 represents a transverse vertical sectional view of a duplex superheater embodying the improvements. Fig. 6 represents a top plan view of a further modification of the invention. Fig. 7 represents a sectional view takenon the line 7 ,7 of Fig. 6. Fig. 8 represents an end view of manifolds that may be employed, together with the connections therewith of the superheating-tubes; and Fig. 9 represents a side view of the manifolds.

As shown in the drawings, the invention comprises the combination of a heating system with a steam-circulating system.

The heating system comprises a reverberatory furnace having the fuel or first combustion chamber land the grate 2 locatedbetween the outer walll and the bridge-wall 3,

which latter combines with the furnace-roof 4 to form a pass 5 and with the division-wall 6 to form a mixing or second combustion chamber 7. The bridge-wall is provided with an air-passage 8, having an adjustable register or registers 9 for controlling the air-intake thereto and the ports 10 for passing the air into the mixing-chamber. The products of combustion passing from the grate 2 through the pass 5 and the air passing through the ports 10 combine in the chamber 7, thence Thealternating baffles extend from opposite sides of the chamber partially across the same a'nd are supported on the tubes 16 of the r steam-circulatlng system to form a series of I communicating passes for carrying the gaseous products of combustion from the chamber 12 to the stack 17 in intimate contact with the members of the steam-circulating system.

To provide ready access to these passes, the

chamber is provided with the doors 18.

The steam-circulating system comprises the main or intake 19, having the branches 20 and 20, which communicate with the respective horizontal boxes or head-sections 21 and 21 I00 of the sectional front header or headers. The boxes 21 and 21' are connected, respectively, with the similar boxes or header-sections 22 and 22 of the sectional rear header or headers by the top set of the tubes 16. The boxes 22 and 22 are connected with the respective boxes 23' and'23 by the next lower set of tubes. The boxes 23 and 23 are connected with the respective boxes 24 and 24 by the next lower set of tubes. The boxes 24 and 24 are connected with the respective boxes 25 and 25 by the nextlower set of tubes. The boxes 25 and 25 are connected with the respective boxes 26 and 26 bythe next lower set of tubes. The boxes 26 and 26 are connected with the respective boxes 27 and 27 by the nextlowerset of tubes. The boxes 27 and 27"are connected with the respective boxes 28 and 28 by thenext lower set of tubes. The boxes 28 and 28 are connected with the respective boxes 29 and 29 by the next lower set of tubes, and the boxes 29 and 29 are connected, by the branches 44 and 44, with the main or take ofl' 46, by which the saturated steam is passed downward through the circulating system and issues therefrom in adry or superheated condition.

The respective front-header sections have their lower parts connected, by the branches 31 and 31, 33 and 33, and 35 and 35, with the drain-pipe 39, provided with the valves 43 and 43. The respective branches 44 and 44 are connected with the drain-pipe 39 by the branches 41 and 41', controlled by the valves 45 and 45. In a similar manner the sections of the rear header or headers are connected, as by the branches 32, 34, 36, and 38, with a drain-pipe 40, controlled by the valve *40.

r In the construction shown in Fig. 4 the superheating-chamber is in direct communication with the second combustion-chamber, being located at the side of the furnace.

In the construction shown in Fig. 5, being aduplex construction embodying the arrangements shown in Fig. 1, a wall 50 divides the two heating systems, having the common stack 17, which combine with the respective steam-circulating systems therein. This construction provides flexibility of operation, permitting the use of either the whole or a part of the total system, as may be expedient. Both units may be employed where the full superheating capacity is required, and either part may be cut out when less dry steam is desired or repairs are necessary.

As shown in Figs. 6 and 7, the superheating-chamber is in direct communication with the mixing-chamber and is located in the rear of the furnace. The manifolds 60 and 61 and the tubes 62 have the general arrangement shown in Figs. 8 and 9, the steam from one bank of tubes entering the branch'of the manifold connected therewith and passing therethrough into the other branch flows therefrom through the next bank of tubes connected therewith.

In Figs. 8 and 9 are shown double rows of tubes 63, connected with each branch of the respective manifolds and removable caps 63, through which the tubes may be inserted or withdrawn.

It will now be seen that the steam-circulating system is heated by a direct-heating system as distinguished from those constructions in which the superheater is incorporated with a boiler and heated by products of combustion that are devoted primarily to heating the boiler, my invention contemplating a superheating system separated from and heated independently of the boiler. In my ii'nprovements the products of combustion are carried directly from the furnace to the superheatingchamber without performing any intermediate work and travel through the superheating-ohamber in a direction opposite to the travel of the steam therethrough. The introduction of cold air, which takes place at a point between the system to be heated and the primary combustion-chamber, tempers the live products of combustion, so that they impinge upon the steam-circulating system at a greatly-reduced temperature. By this mode of operation the destructive action upon the tubes is greatly reduced and a high degree of superheating eiiiciency obtained.

- Having described my invention, I claim 1. In a superheater, the combination of a superheating-chamber, with a steam-circulating system comprisinga plurality of banks of tubes having their respective ends connected together by a common connection so that the several adjacent banks form sections of a continuous steam-circulating course, baflles for said tubes, a series of communicating passes formed by said bafiies, a furnace communieating with and supplying hot gases to said passes, and a duct or ducts for introducing cold air into said gases and tempering their action upon said steam-circulating system, substantially as specified.

2. In a superheater, the combination of a superheating-chamber, with a steam-circulating system comprising a plurality of banks of tubes having their respective ends connected together by a common connection so that the several adjacent banks form sections of a continuous steam-circulating course, a series of battles in said superheating-chamber extending transversely to said tubes, a series of communicating passes formed by said baflies extending transversely to the course of said tubes, a combustion-chamber communicating with said passes, and an inlet to said combustion-chamber for supplying cold air to and tempering the gases admitted to said passes, substantially as specified.

3. In a superheater, the combination of a superheating-chamber, with a steam-circulating system comprising a steam-intake, a header composed of independent horizontallyarranged sections, a second header composed of independent horizontally-arranged sections, banks of tubes connecting the respective sections of said first header with corresponding sections of said second header, so that steam passes in opposite directions through adjacent banks of tubes, a reverbera tory furnace directly connected with said superheating chamber and supplying hot gases thereto, and a duct or ducts for admit-- ting cold air to the hotgases passing from said furnace to said circulating-chamber, substantially as specified.

4:. Ina superheater asteam-circulating system comprising a steam-intake, a header composed of independent horizontally-arranged sections, a second header composed of independent horizontally-arranged sections, banks of tubes connecting the respective sections of said first header with corresponding sections of'said second header, a steam take-off, and draining mechanism connected with the respective sections of said headers, in combination with a superheating-chamber, a reverberatory. furnace connected with said superheatingchamber and supplying hot gases thereto, and a duct or ducts for admitting cold air to said hot gases and tempering the heating action thereof, substantially as specified.

5. In asuperheater, a steam-circulating system comprising a steam-intake, a bank of tubes respectively connected by a common connection with said intake, a second bank of tubes respectively connected by a common connec' tion with said first bank of tubes, asteamtakeoff connected therewith, in combination with a reverberatory furnace, and aninlet for admitting air to and tempering the gases passing from said furnace to said steam-circulating system, substantially as specified.

6. In a superheater, a steam-circulating system comprising a steam-intake having a.plurality of branches, a header composed of a plurality of independent vertical sections each containing a series of horizontal conduits, said sections being connected respectively with said branches, a second header composed of a plurality of independent vertical sections each containing a series of horizontal conduits, tubes connecting the respective conduits of said first header in series with the respective conduits of said second header so as to join them as successive parts of a continuous steam-circulating course, a steam take-off having branches connected with the respectiveof a set of independent horizontally-arranged conduits, a second set of headers each composed of a set of independent horizontally-arranged cond uits, tubes connecting the conduits of said first headers with the conduits of said second headers, in combination with a plurality of superheating-chambers, a plurality of reverberatory furnaces communicating with said superheating-chambers for supplying hot gases thereto, and a duct or ducts for admitting cold air to and tempering the action of said hot gases, substantially as specified.

8. In asuperheater, the combination ofa superheating-chamber, with a steam-circulating system comprising a plurality of banks of tubes having their respective ends connected so that the several banks form communicating sections in a continuous steam-circulating course or courses, a furnace having a direct connection with saidv superheating-chamber for supplying gaseous products of combustion directly to said tubes, and aduct or ducts for introducing cold air to said products of combustion and tempering the same prior to their upon said tubes, substantially as speciheating-chamber in adirection opposite to the I flow of steam therethrough, and a duct or ducts for introducing air for admixture with and reduction'of the temperature of said heated products of combustion prior to passing the same through said superheating-chamber, substantially as specified.

In testimony whereof I have hereunto set my hand, in the presence of the subscribing witnesses,this 8th 'day of December,A.D. 1902.

. JOHN A. STEVENS.

Witnesses:

GEORGE M. STEVENS, WALTER SLADER. 

